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This may have been discussed before, but a few searches came up with nothing so ill preceed.

Looking through the screenshots with the combine in them, I notcied that they have different coloured gas masks.
For example here
http://www.halflife2.net/image_files/17.jpg
they have black gas masks, but here;
http://www.halflife2.net/image_files/11.jpg
they have white gas masks.

Do you think this has any relevance? Such as ranks, assigned jobs i.e alien hunters/human hunters?

What do yout think?
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